The bot does discriminate - every identical spam comment left after you indiscriminately flag a post, is flagged. Result is that any indiscrimnate element is introduced by your own action.

Flagging spam does not qualify as censorship.

Flagging all posts that use a promotional service that you happen to disagree with, is censorship. It is the same as removing a journalist's salary and burning his articles, all copies of TIME magazine on the book shelves, because he published an article in TIME Magazine, and you disagree with TIME magazine.